230mm Case Fan. A 230 mm PC case fan will move a large volume of air into or out of your computer. We stock 230 mm dc case fans including the bitfenix spectre pro 230mm. No matter what 230mm computer case fans you're looking to buy, we've got the right si 230 mm fans are larger than most standard case fans. If your computer case fan needs require a 230mm computer case fan then purchase one. These fans measure 9 inches on each side.